EXT_disjoint_timer_query

The EXT_disjoint_timer_query extension is part of the WebGL API and provides a way to measure the duration of a set of GL commands, without stalling the rendering pipeline.

WebGL extensions are available using the WebGLRenderingContext.getExtension() method. For more information, see also Using Extensions in the WebGL tutorial.

Note: This extension should be available in WebGL1 contexts only. EXT_disjoint_timer_query_webgl2 is available in WebGL 2 contexts .

In WebGL 2, the getQueryObject was renamed to getQueryParameter. In WebGL 2, other queries (such as occlusion queries and primitive queries) are possible using WebGLQuery objects.

Types

This extension exposes a new type:

GLuint64EXT: Unsigned 64-bit integer number.

Constants

This extension exposes seven new constants.

ext.QUERY_COUNTER_BITS_EXT: A GLint indicating the number of bits used to hold the query result for the given target.
ext.CURRENT_QUERY_EXT: A WebGLQuery object, which is the currently active query for the given target.
ext.QUERY_RESULT_EXT: A GLuint64EXT containing the query result.
ext.QUERY_RESULT_AVAILABLE_EXT: A GLboolean indicating whether or not a query result is available.
ext.TIME_ELAPSED_EXT: Elapsed time (in nanoseconds).
ext.TIMESTAMP_EXT: The current time.
ext.GPU_DISJOINT_EXT: A GLboolean indicating whether or not the GPU performed any disjoint operation.

Methods

This extension exposes eight new methods.

ext.createQueryEXT(): Creates a new WebGLTimerQueryEXT.
ext.deleteQueryEXT(): Deletes a given WebGLTimerQueryEXT.
ext.isQueryEXT(): Returns true if a given object is a valid WebGLTimerQueryEXT.
ext.beginQueryEXT(): The timer starts when all commands prior to beginQueryEXT have been fully executed.
ext.endQueryEXT(): The timer stops when all commands prior to endQueryEXT have been fully executed.
ext.queryCounterEXT(): Records the current time into the corresponding query object.
ext.getQueryEXT(): Returns information about a query target.
ext.getQueryObjectEXT(): Return the state of a query object.

Examples

var ext = gl.getExtension('EXT_disjoint_timer_query');

Specifications

Specification
WebGL EXT_disjoint_timer_query Extension Specification (WebGL EXT_disjoint_timer_query Extension)

Browser compatibility

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet
`EXT_disjoint_timer_query`	47-65 Removed due to the GLitch exploit.	No	51-59 Removed due to the GLitch exploit.	No	34-52 Removed due to the GLitch exploit.	No	47-65 Removed due to the GLitch exploit.	47-65 Removed due to the GLitch exploit.	No	34-47 Removed due to the GLitch exploit.	No	5.0-9.0 Removed due to the GLitch exploit.
`beginQueryEXT`	47-65 Removed due to the GLitch exploit.	No	51-59 Removed due to the GLitch exploit.	No	34-52 Removed due to the GLitch exploit.	No	47-65 Removed due to the GLitch exploit.	47-65 Removed due to the GLitch exploit.	No	34-47 Removed due to the GLitch exploit.	No	5.0-9.0 Removed due to the GLitch exploit.
`createQueryEXT`	47-65 Removed due to the GLitch exploit.	No	51-59 Removed due to the GLitch exploit.	No	34-52 Removed due to the GLitch exploit.	No	47-65 Removed due to the GLitch exploit.	47-65 Removed due to the GLitch exploit.	No	34-47 Removed due to the GLitch exploit.	No	5.0-9.0 Removed due to the GLitch exploit.
`deleteQueryEXT`	47-65 Removed due to the GLitch exploit.	No	51-59 Removed due to the GLitch exploit.	No	34-52 Removed due to the GLitch exploit.	No	47-65 Removed due to the GLitch exploit.	47-65 Removed due to the GLitch exploit.	No	34-47 Removed due to the GLitch exploit.	No	5.0-9.0 Removed due to the GLitch exploit.
`endQueryEXT`	47-65 Removed due to the GLitch exploit.	No	51-59 Removed due to the GLitch exploit.	No	34-52 Removed due to the GLitch exploit.	No	47-65 Removed due to the GLitch exploit.	47-65 Removed due to the GLitch exploit.	No	34-47 Removed due to the GLitch exploit.	No	5.0-9.0 Removed due to the GLitch exploit.
`getQueryEXT`	47-65 Removed due to the GLitch exploit.	No	51-59 Removed due to the GLitch exploit.	No	34-52 Removed due to the GLitch exploit.	No	47-65 Removed due to the GLitch exploit.	47-65 Removed due to the GLitch exploit.	No	34-47 Removed due to the GLitch exploit.	No	5.0-9.0 Removed due to the GLitch exploit.
`getQueryObjectEXT`	47-65 Removed due to the GLitch exploit.	No	51-59 Removed due to the GLitch exploit.	No	34-52 Removed due to the GLitch exploit.	No	47-65 Removed due to the GLitch exploit.	47-65 Removed due to the GLitch exploit.	No	34-47 Removed due to the GLitch exploit.	No	5.0-9.0 Removed due to the GLitch exploit.
`isQueryEXT`	47-65 Removed due to the GLitch exploit.	No	51-59 Removed due to the GLitch exploit.	No	34-52 Removed due to the GLitch exploit.	No	47-65 Removed due to the GLitch exploit.	47-65 Removed due to the GLitch exploit.	No	34-47 Removed due to the GLitch exploit.	No	5.0-9.0 Removed due to the GLitch exploit.
`queryCounterEXT`	47-65 Removed due to the GLitch exploit.	No	51-59 Removed due to the GLitch exploit.	No	34-52 Removed due to the GLitch exploit.	No	47-65 Removed due to the GLitch exploit.	47-65 Removed due to the GLitch exploit.	No	34-47 Removed due to the GLitch exploit.	No	5.0-9.0 Removed due to the GLitch exploit.